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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 283 · 40 questions
TalentJR

The fast method (Step from a neighbour): Find the round neighbour and square it: 70² = 7 × 7 = 49, then two 0s → 4900. Ends in 1 (one more)? Add the round number and the number: 4900 + 70 + 71. Ends in 9 (one less)? Take them away: 69² = 4900 − 70 − 69 = 4761.

NameDateTime takenScore ___ / 40
  1. 1.49² =
  2. 2.19² =
  3. 3.51² =
  4. 4.81² =
  5. 5.39² =
  6. 6.81² =
  7. 7.89² =
  8. 8.39² =
  9. 9.49² =
  10. 10.39² =
  11. 11.61² =
  12. 12.29² =
  13. 13.21² =
  14. 14.19² =
  15. 15.21² =
  16. 16.79² =
  17. 17.71² =
  18. 18.19² =
  19. 19.59² =
  20. 20.91² =
  21. 21.91² =
  22. 22.19² =
  23. 23.51² =
  24. 24.19² =
  25. 25.89² =
  26. 26.89² =
  27. 27.29² =
  28. 28.79² =
  29. 29.79² =
  30. 30.39² =
  31. 31.49² =
  32. 32.51² =
  33. 33.39² =
  34. 34.19² =
  35. 35.59² =
  36. 36.39² =
  37. 37.91² =
  38. 38.81² =
  39. 39.89² =
  40. 40.89² =

Answer key

  1. 2401
  2. 361
  3. 2601
  4. 6561
  5. 1521
  6. 6561
  7. 7921
  8. 1521
  9. 2401
  10. 1521
  11. 3721
  12. 841
  13. 441
  14. 361
  15. 441
  16. 6241
  17. 5041
  18. 361
  19. 3481
  20. 8281
  21. 8281
  22. 361
  23. 2601
  24. 361
  25. 7921
  26. 7921
  27. 841
  28. 6241
  29. 6241
  30. 1521
  31. 2401
  32. 2601
  33. 1521
  34. 361
  35. 3481
  36. 1521
  37. 8281
  38. 6561
  39. 7921
  40. 7921

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